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|
(;module: {#;doc "Tools for unit & property-based/generative testing."}
lux
(lux [macro #+ Monad<Lux> with-gensyms]
(macro ["s" syntax #+ syntax: Syntax]
[code])
(control ["M" monad #+ do Monad]
["p" parser])
(concurrency [promise #+ Promise Monad<Promise>])
(data (coll [list "L/" Monad<List> Fold<List>])
[product]
[maybe]
[text]
text/format
["E" result])
[io #- run]
(time [instant]
[duration])
["R" math/random]))
## [Host]
(do-template [<name> <signal>]
[(def: #hidden <name> (IO Bottom)
(io (_lux_proc ["io" "exit"] [<signal>])))]
[exit 0]
[die 1]
)
## [Types]
(type: Counters [Nat Nat])
(type: #export Test
{#;doc "Tests are asynchronous process which may fail."}
(Promise [Counters Text]))
## [Values]
(def: success Counters [+1 +0])
(def: failure Counters [+0 +1])
(def: start Counters [+0 +0])
(def: (add-counters [s f] [ts tf])
(-> Counters Counters Counters)
[(n.+ s ts) (n.+ f tf)])
(def: (fail message)
(All [a] (-> Text Test))
(:: Monad<Promise> wrap [failure (format " [Error] " (%t message))]))
(def: #export (test message condition)
{#;doc "Check that a condition is true, and fail with the given message otherwise."}
(-> Text Bool Test)
(if condition
(:: Monad<Promise> wrap [success (format "[Success] " message)])
(:: Monad<Promise> wrap [failure (format " [Error] " message)])))
(def: #hidden (run' tests)
(-> (List [Text (IO Test) Text]) (Promise Counters))
(do Monad<Promise>
[test-runs (|> tests
(L/map (: (-> [Text (IO Test) Text] (Promise Counters))
(function [[module test description]]
(do @
[#let [pre (io;run instant;now)]
[counters documentation] (io;run test)
#let [post (io;run instant;now)
_ (log! (format "@ " module " "
"(" (%i (duration;to-millis (instant;span pre post))) "ms" ")"
"\n"
description "\n"
"\n" documentation "\n"))]]
(wrap counters)))))
(M;seq @))]
(wrap (L/fold add-counters start test-runs))))
(def: pcg-32-magic-inc Nat +12345)
(type: #export Seed
{#;doc "The seed value used for random testing (if that feature is used)."}
Nat)
(def: failed?
(-> Counters Bool)
(|>. product;right (n.> +0)))
(def: (try seed random-test)
(-> Seed (R;Random Test) (Promise [Seed [Counters Text]]))
(let [[prng [new-seed test]] (R;run (R;pcg-32 [pcg-32-magic-inc seed])
(do R;Monad<Random>
[test random-test
next-seed R;nat]
(wrap [next-seed test])))]
(do Monad<Promise>
[result test]
(wrap [new-seed result]))))
(def: (repeat' seed times random-test)
(-> Seed Nat (R;Random Test) Test)
(if (n.= +0 times)
(fail "Cannot try a test 0 times.")
(do Monad<Promise>
[[seed' [counters documentation]] (try seed random-test)]
(cond (failed? counters)
(wrap [counters
(format "Context failed with this seed: " (%n seed) "\n" documentation)])
(n.= +1 times)
(wrap [counters documentation])
## else
(repeat' seed' (n.dec times) random-test)))))
(def: #hidden (repeat ?seed times random-test)
(-> (Maybe Nat) Nat (R;Random Test) Test)
(repeat' (maybe;default (|> (io;run instant;now) instant;to-millis int-to-nat)
?seed)
(case ?seed
#;None times
(#;Some _) +1)
random-test))
## [Syntax]
(type: Test-Config
(#Seed Nat)
(#Times Nat))
(type: Property-Test
{#seed (Maybe Test-Config)
#bindings (List [Code Code])
#body Code})
(type: Test-Kind
(#Property Property-Test)
(#Simple Code))
(def: config^
(Syntax Test-Config)
(p;alt (do p;Monad<Parser>
[_ (s;this (' #seed))]
s;nat)
(do p;Monad<Parser>
[_ (s;this (' #times))]
s;nat)))
(def: property-test^
(Syntax Property-Test)
($_ p;seq
(p;opt config^)
(s;tuple (p;some (p;seq s;any s;any)))
s;any))
(def: test^
(Syntax Test-Kind)
(p;alt property-test^
s;any))
(def: (pair-to-list [x y])
(All [a] (-> [a a] (List a)))
(list x y))
(def: #hidden (try-body lazy-body)
(-> (IO Test) Test)
(case (_lux_proc ["lux" "try"] [lazy-body])
(#E;Success output)
output
(#E;Error error)
(test error false)))
(syntax: #export (context: description [body test^])
{#;doc (doc "Macro for definint tests."
(context: "Simple macros and constructs"
($_ seq
(test "Can write easy loops for iterative programming."
(i.= 1000
(loop [counter 0
value 1]
(if (i.< 3 counter)
(recur (i.inc counter) (i.* 10 value))
value))))
(test "Can create lists easily through macros."
(and (case (list 1 2 3)
(#;Cons 1 (#;Cons 2 (#;Cons 3 #;Nil)))
true
_
false)
(case (list& 1 2 3 (list 4 5 6))
(#;Cons 1 (#;Cons 2 (#;Cons 3 (#;Cons 4 (#;Cons 5 (#;Cons 6 #;Nil))))))
true
_
false)))
(test "Can have defaults for Maybe values."
(and (is "yolo" (maybe;default "yolo"
#;None))
(is "lol" (maybe;default "yolo"
(#;Some "lol")))))
))
"Also works with random generation of values for property-based testing."
(context: "Addition & Substraction"
[x (:: @ map <prep> rand-gen)
y (:: @ map <prep> rand-gen)]
(test ""
(and (|> x (- y) (+ y) (= x))
(|> x (+ y) (- y) (= x)))))
"By default, random tests will be tried 100 times, you can specify the amount you want:"
(context: "Addition & Substraction"
#times +1234
[x (:: @ map <prep> rand-gen)
y (:: @ map <prep> rand-gen)]
(test ""
(and (|> x (- y) (+ y) (= x))
(|> x (+ y) (- y) (= x)))))
"If a test fails, you'll be shown a seed that you can then use to reproduce a failing scenario."
(context: "Addition & Substraction"
#seed +987654321
[x (:: @ map <prep> rand-gen)
y (:: @ map <prep> rand-gen)]
(test ""
(and (|> x (- y) (+ y) (= x))
(|> x (+ y) (- y) (= x)))))
)}
(let [body (case body
(#Property config bindings body)
(let [[=seed =times] (case config
#;None
[(` #;None) +100]
(#;Some (#Seed value))
[(` (#;Some (~ (code;nat value)))) +100]
(#;Some (#Times value))
[(` #;None) value])
bindings' (|> bindings (L/map pair-to-list) L/join)]
(` (repeat (~ =seed)
(~ (code;nat =times))
(do R;Monad<Random>
[(~@ bindings')]
((~' wrap) (;;try-body (io;io (~ body))))))))
(#Simple body)
body)]
(with-gensyms [g!test]
(wrap (list (` (def: #export (~ g!test)
{#;;test (#;TextA (~ description))}
(IO Test)
(io (~ body)))))))))
(def: (exported-tests module-name)
(-> Text (Lux (List [Text Text Text])))
(do Monad<Lux>
[defs (macro;exports module-name)]
(wrap (|> defs
(L/map (function [[def-name [_ def-anns _]]]
(case (macro;get-text-ann (ident-for #;;test) def-anns)
(#;Some description)
[true module-name def-name description]
_
[false module-name def-name ""])))
(list;filter product;left)
(L/map product;right)))))
(def: #hidden _composeT_ (-> Text Text Text) (:: text;Monoid<Text> compose))
(def: #hidden _%i_ (-> Int Text) %i)
(syntax: #export (run)
{#;doc (doc "Runs all the tests defined on the current module, and in all imported modules."
(run))}
(with-gensyms [g!successes g!failures g!total-successes g!total-failures]
(do @
[current-module macro;current-module-name
modules (macro;imported-modules current-module)
tests (: (Lux (List [Text Text Text]))
(|> (#;Cons current-module modules)
list;reverse
(M;map @ exported-tests)
(:: @ map L/join)))
#let [tests+ (L/map (function [[module-name test desc]]
(` [(~ (code;text module-name)) (~ (code;symbol [module-name test])) (~ (code;text desc))]))
tests)
num-tests (list;size tests+)
groups (list;split-all promise;concurrency-level tests+)]]
(wrap (list (` (: (IO Unit)
(io (exec (do Monad<Promise>
[(~' #let) [(~ g!total-successes) +0
(~ g!total-failures) +0]
(~@ (L/join (L/map (function [group]
(list (` [(~ g!successes) (~ g!failures)]) (` (run' (list (~@ group))))
(' #let) (` [(~ g!total-successes) (n.+ (~ g!successes) (~ g!total-successes))
(~ g!total-failures) (n.+ (~ g!failures) (~ g!total-failures))])))
groups)))]
(exec (log! ($_ _composeT_
"Test-suite finished."
"\n"
(_%i_ (nat-to-int (~ g!total-successes)))
" out of "
(_%i_ (nat-to-int (n.+ (~ g!total-failures)
(~ g!total-successes))))
" tests passed."
"\n"
(_%i_ (nat-to-int (~ g!total-failures))) " tests failed."))
(promise;future (if (n.> +0 (~ g!total-failures))
;;die
;;exit))))
[])))))))))
(def: #export (seq left right)
{#;doc "Sequencing combinator."}
(-> Test Test Test)
(do Monad<Promise>
[[l-counter l-documentation] left
[r-counter r-documentation] right]
(wrap [(add-counters l-counter r-counter)
(format l-documentation "\n" r-documentation)])))
|
